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Re: Gap Dwell Times (formerly: Beating Solved)
Some measurements captured on the storage scope from my coil (just
now):
Calculated spec : k around 0.12 (from dF/F)
Measured : f = 146.5kHz
Tdwell around 25uS (time to max sec ringup, pri ringdown to near zero)
Envelope time (ringup+ringdown for one complete envelope) about 50uS
Cycles during Tdwell = 3.5 (7 half cycles)
Blowing compressed air through the gap made no noticeable difference
but the gap discharge got much "snappier" and noisy.
Primary Alone: Cap = 0.1uF, Lp 11.8uH Times are +- 5uS
Cap Voltage Cap Energy Rings Dwell Time Q (from decr. calc)
2kV 200mJ 15 100uS 8.6
5kV 1.25J 19 130uS 10.2
8kV 3.2J 21 150uS 8.1
10kV 5J 22 155uS 8.9
12kV 7.2J 23 160uS 10.3
Re - Q : because of artifacts adding some randomness to the waveform
it was difficult to get exact peak readings. I haven't attempted to
dress the figures up in any way, but I think you can see the trends.
Accuracy for Q about +-1
Blasting air through the gap at 10kV cut it off at 140uS. Discharge
very loud and sharp. I'm sorry I don't know what the pressure was but
it is an industrial compressed air source blown through a fine nozzle.
This was rather dangerous but a quick way of checking. Not advised.
Hopefully this will answer one or two questions.
Malcolm